UICollectionView prepareForSegue indexPathForCell为零的iOS 9

Question

问题是这样的线回零：

if let indexPath = self.collectionView?.indexPathForCell(sender as! UICollectionViewCell) 

出于这个原因，我不能传递任何信息，该标识符被设置，该委托被设置。

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    if segue.identifier == "DetalleSegueIdentifier" { 
     if let indexPath = self.collectionView?.indexPathForCell(sender as! UICollectionViewCell) { 
      let detailVC = segue.destinationViewController as! DetalleNoticiaViewController 
      detailVC.contact = self.noticia[indexPath.row] 
     } 
    } 
} 

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { 
    self.performSegueWithIdentifier("DetalleSegueIdentifier", sender: collectionView.cellForItemAtIndexPath(indexPath)) 
} 

任何帮助？

Answer 1

问题是变种的CollectionView是不是在我的ViewController引用这个原因总是返回零。我的错误感谢你的答案。

@IBOutlet weak var collectionView: UICollectionView! 

Answer 2

问题是如何尝试恢复单元格。您必须在performSegueWithIdentifier中传递单元格，然后在prepareForSegue中恢复它。 下面是代码：

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { 
    self.performSegueWithIdentifier("DetalleSegueIdentifier", sender: collectionView.cellForItemAtIndexPath(indexPath)) 
} 

然后

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    if segue.identifier == "DetalleSegueIdentifier" { 
     if let cell = sender as? UICollectionViewCell{ 
      let indexPath = self.collectionView!.indexPathForCell(cell) 
      let detailVC = segue.destinationViewController as! DetalleNoticiaViewController 
      detailVC.contact = self.noticia[indexPath.row] 

     } 

    } 
} 

希望它能帮助！

Answer 3

尝试这样的..

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { 
     self.performSegueWithIdentifier("DetalleSegueIdentifier", sender: indexPath) 
    } 

，让你的indexpath这样的...

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
     if segue.identifier == "DetalleSegueIdentifier" { 

      let aIndPath = sender as! NSIndexPath 

      let detailVC = segue.destinationViewController as! DetalleNoticiaViewController 
      detailVC.contact = self.noticia[aIndPath.item] 
     } 
    }